XYZ-Wing 367 hinged in r2c5; r3c5<>6 opens a Kite on 6 originating from BOX 3; r5c6<>6 leading to an XY-Wing (17) (19) (79) pivoted in r6c6; r4c9<>7 which solves it.
Also the BUG+1 at this stage solves it as well; r4c5=7.